class ResponseRate
  def initialize(subcategory:, school:, academic_year:)
    @subcategory = subcategory
    @school = school
    @academic_year = academic_year
  end

  def rate
    return 0 unless survey_item_count.positive?

    average_responses_per_survey_item = response_count / survey_item_count.to_f

    return 0 unless total_possible_responses.positive?

    (average_responses_per_survey_item / total_possible_responses.to_f * 100).round
  end
end